/**
 * @file localbtn.c
 * @brief Local GPIO0 BTN reading implementation using edge capture
 */

#include "localbtn.h"

#include "driver/gpio.h"
#include "esp_timer.h"
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "soc/gpio_num.h"

#include <string.h>

static const char *TAG = "LOCALBTN";
uint8_t current_mode;
bool initialized;
TaskHandle_t localbtnTaskhandle;
localbtn_mode_change_callback_t callback;

#define BOOT_BTN GPIO_NUM_0 // TODO: move to config

bool boot_button_pressed(void)
{
    return gpio_get_level(BOOT_BTN) == 0; // active LOW
}

static void localbtn_task(void *arg)
{
    bool lastState = false;
    while (1)
    {
        vTaskDelay(pdMS_TO_TICKS(10));

        bool currentState = boot_button_pressed();
        if ((currentState) && (lastState != currentState))
        {
            printf("BOOT button pressed\n");

            if (callback)
            {
                callback(current_mode);
            }
        }

        lastState = currentState;
    }
}

esp_err_t localbtn_init()
{

    gpio_config_t io_conf = {
        .pin_bit_mask = 1ULL << BOOT_BTN,
        .mode = GPIO_MODE_INPUT,
        .pull_up_en = GPIO_PULLUP_ENABLE, // safe even if external pull-up exists
        .pull_down_en = GPIO_PULLDOWN_DISABLE,
        .intr_type = GPIO_INTR_DISABLE};
    ESP_ERROR_CHECK(gpio_config(&io_conf));

    // Create monitor task
    BaseType_t ret = xTaskCreate(localbtn_task, "localbtn_monitor", 2048, NULL, 5, &localbtnTaskhandle);
    if (ret != pdPASS)
    {
        return ESP_FAIL;
    }

    initialized = true;
    ESP_LOGI(TAG, "local btn initialized on GPIO%d", BOOT_BTN);

    return ESP_OK;
}

void localbtn_deinit(void)
{
    if (!initialized)
    {
        return;
    }

    if (localbtnTaskhandle)
    {
        vTaskDelete(localbtnTaskhandle);
        localbtnTaskhandle = NULL;
    }
    initialized = false;
}

void localbtn_register_callback(localbtn_mode_change_callback_t cb)
{
    callback = cb;
}